Rotary cutter



H. GORA ROTARY CUTTER Mach 13, 1934.

Filed Nov. 1, 1932 Patented Mar. 13, 1934 UNITED STTES ROTARY CUTTER Henry Gora,

Bridgeport, Conn.,

assigner to Jenkins Bros., New York, N. Y., a. corporation of New Jersey Application November 1, 1932, Serial No. 640,696

6 Claims.

The invention relates to certain improvements in rotary cutters, more particularly to cutters of the type employed for cutting rubber rings from lengths of rubber tubing, as exemplified in my Patent No. 1,864,903, dated June 28, 1932, in which two cutters are mounted on opposite sides of a rotating mandrel, operating in parallel planes spaced a distance equal to the thickness of one ring or annulus, so that, when the cutters are simultaneously advanced toward the mandrel, they will cut two annuli from a tube carried by the mandrel. The present invention is designed to provide means for accurately adjusting at least one of the cutters in an axial direction, so that an exact predetermined spacing of the parallel planes of the operation of the cutters may be maintained and the severance of rings of uniform thickness effected.

The invention is illustrated in the accompany- 'ing drawing, in which:-

Fig. 1 is a front elevation of a swinging rotary cutter of the type illustrated in the patent aforesaid.

Fig. 2 is an end elevation of the same.

Fig. 3 is a section on line 3--3 of Fig. 1.

Fig. 4 is an elevation, partly in section, of the micrometer screw.

While the invention has been illustrated as applied to a cutter having a swinging or pivotal lmotion with respect to the work, it will be understoodV that this is merely exemplary and that the invention is equally applicable to cutters of other types, such, for example, as those mounted for sliding motion or cutters which are mounted upon La stationary base. Referring to the drawing, l

indicates the base, which, in the particular form of cutter illustrated, is adapted to be pivotally mounted on the machine frame, so that the cutter may be swung toward and from the work to be operated upon. The base 1 is provided with a generally flat surface 2 in which is formed a longitudinal groove 3, preferably in the form of the slot member of a dovetailed joint. There is also formed in the base 1 a longitudinal slit 4 opening into the slot 3, which admits of the latter being constricted transversely to serve as a clamp, when a set screw 6, threaded into the base and extending across the slot 4, is set up. Mounted for sliding adjustment on the upper dat surface of the .base is a yoke 10 provided with a flat lower face 11 engaging the lat upper face 2 of the base and being provided with a tongue 12, which is'complementary to the slot 3 in the base as shown, the tongue and groove engagement between the yoke Zand base being of the dovetailed type. The two lateral arms oi the yoke l0 are provided'with aligning perforated lugs 13 in which are mounted bearing pins 14, which are locked in position by set nuts 15 and 16, said bearing pins being provided with coned bearings on their inner ends to receive the similarly coned ends of a pintle 17, which carries the knife or cutter 20, which is locked securely in position on the intermediate part of the pintle between a shoulder 13 and a set nut 19 engaging screw threads 2l on the pintle.

As thus constructed, the yoke'carrying theY rotary knife is capable of longitudinal adjustment on the base by reason of the dovetailed joint between the base and the yoke and the cutter may be securely locked in any position of adjustment by means of the set screw 6, which serves to iorce the sides oi the dovetailed groove or slot into firm engagement with the side faces of the dovetailed tongue.

In order to effect the accurate adjustment of the knife or cutter 20, a micrometer screw adjustment between the yoke and the base is provided which preferably takes the form illustrated. The base 1 is provided with an upstanding shoulder 5 at one side, which is provided with an axial bore 5 having a counterbored outer section, the bore 5 being in registering alignment with an interiorly threaded socket 30 formed in and extending longitudinally of the lower portion of the yoke 10. J ournaled for rotary motion only in the bore 5 in the base is a micrometer screw 25 provided on one end with iine screw threads engaging the threads in the bore or socket 30 of the yoke. The outer end of the micrometer screw is provided with a removable, knurled head 27, which is removably secured to the screw by means of a pin 28, the inner reduced portion of the head having a peripheral scale thereon adapted to cooperate with a suitable index or pointer lixed to an appropriate part of the base. The micrometer screw 25 is formed with a xed collar 26 which engages the counterbored section of the bore 5 and the screw is held against longitudinal movement in the base by means of a plate 29 secured to the lateral face of the base by screws 31 and having an opening registering with the bore 5 in the upstanding shoulder 5.

From the foregoing arrangement and disposition of the parts, it will be seen that extremely accurate adjustments of the rotary cutter 20 may be effected by backing off the clamping screw 6 to permit the yoke 10 to slide freely on the base 1 and then rotating the micrometer screw 25 by means of its head 27, thereby causing a sliding movement between the yoke 10 and the Soffbase in one direction or the other and to the desired extent, depending upon the direction of rotation of the micrometer screw. When the exact adjustment of the knife 20 has been attained, the clamping screw 6 is set up, thereby locking the yoke 10 to the base and securely holding the knife in its adjusted position.

What I claim is:

1. The combination of a base pivoted for rocking movement, a yoke mounted for sliding longitudinal adjustment on the base, a rotary cutter journaled in the yoke on an axis parallel to the direction of adjustment of the yoke on the base,

and a micrometer screw connecting the yoke and` the base to effect fine adjustments of the cutter along the axis of rotation of the latter.

2. The combination of a base pivoted for rocking movement, a yoke, a dovetailed joint between the yoke and the base to permit longitudinal adjustment of the yoke on the base, a micrometer screw connecting the yoke and the base to effect fine sliding adjustments of the yoke on the base, and a rotary cutter journaled in the yoke.

3. The combination oi a base pivoted for rocking movement, a yoke, a dovetailed joint between the yoke and the base to permit longitudinal adjustment of the yoke on the base, a micrometer screw connecting the yoke and the base to effect fine sliding adjustments of the yoke on the base, means for clamping the yoke to the base, and a rotary cutter journaled in the yoke.

4. The combination of a base pivoted for rocking movement having a flat upper surface with a longitudinal slot therein, a yoke having a flat lower face and a tongue thereon complementary to the slot in the base, a micrometer screw journaled in the base and engaging a threaded socket in the yoke, and a rotary cutter journaled in the yoke.

5. The combination of a base pivoted for rocking movement having a flat upper surface with a longitudinal slot therein, a yoke having a flat lower face and a tongue thereon complementary to the slot in the base, a micrometer screw journaled in the base and engaging a threaded socket in the yoke, means for clamping the yoke to the base, and a rotary cutter journaled in the yoke.

6. The combination of a base pivoted for rocking movement having a flat upper surface with a longitudinal dovetailed slot therein, a slit below the slot and an upright shoulder adjacent one end of the slot, a yoke having a iiat lower face and a tongue thereon complementary to said slot, a micrometer screw journaled in said shoulder and engaging a threaded socket in the yoke, a clamping screw threaded into the base transversely of said slit, and a rotary cutter journaled in the yoke.

HENRY GORA. 

